You're right Gcoe, it didn't answer my question. But thanks for your input.

There are a LOT of approaches used in physio that are not well evidence based but this does not mean they have no role in our treatment. For example acupuncture which is now part of the NICE guidelines for low back pain. There is far too much useless research out there. If any physio claims they only use treatment that has masses of evidence to support it they are lying, it's about using our tool box of skills and treatment techniques and applying them appropriately to each individual patient using our clinical reasoning skills and the patient's own goals.

If anyone can actually answer the question I would be grateful to hear from you. Not interested in a debate about the use of core stability.
Many thanks, J